Due to recent additions and clarification, I've added the following new categories to select when reporting:

Media Support - This will cover issues related to any external media not being handled properly but not crashing the emulation or MAME itself. Such crashing will still accepted as "Crash/Freeze" with the severity being critical.

Plugins - This will cover issues related to issues and regressions of Lua Plugins which are shipped with MAME such as Data, High Scores, Cheats, etc. It isn't for any random malfunctions, but the Lua Scripting needed to handle them.